Sort words by their frequency

Map<String, Integer> freq = new HashMap<>();

for (String word : words) {
 if (!freq.containsKey(word)) {
 freq.put(word, 0);
 }

 freq.put(word, freq.get(word) + 1);
}


List<String> kWords = freq.entrySet()
 .stream()
 .sorted(Collections.reverseOrder(Map.Entry.comparingByValue()));
 .map(Map.Entry::getKey)
 .limit(k)
 .collect(Collectors.toList());